Process for making electrically conductive lines on a non-developable surface of an insulating substrate, tool for carrying out the process and device obtained thereby

Claim 1

A process for making electrically conductive lines on a non-developable surface of an electrically insulating substrate, whereby said surface is firstly uniformly coated with a layer of an electrically conductive matter, said layer being in turn coated with a layer of a protective matter, after which said layer of protective matter and said layer of electrically conductive matter are subjected to the action of a chemical agent for the purpose of selectively eliminating those portions of said layer of electrically conductive matter not corresponding to said lines, process comprising the following steps: after formation of said layers of conductive matter and of protective matter, mechanically tracing thereon the contour of said lines by means of a tool hollowing out grooves of which the depth is at least equal to the thickness of said protective layer, then subjecting said layers to the action of a chemical agent capable of attacking said electrically conductive matter without attacking said protective matter, this chemical attack operation being continued for a sufficient period of time for said electrically conductive matter to be eliminated over the whole of its thickness plumb with said grooves, thereafter separating from the substrate, by peeling, those parts of said layer of electrically conductive matter outside said lines.